/*
 * Copyright 2009 Jesse McLaughlin (nzjess@gmail.com)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.travelfusion.xmlclient.ri.handler.misc;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.xml.stream.XMLStreamConstants;

import org.travelfusion.xmlclient.handler.HandlesRequestsFor;
import org.travelfusion.xmlclient.impl.handler.AbstractXmlToolRequestStAXResponseHandler;
import org.travelfusion.xmlclient.ri.xobject.misc.XCurrency;
import org.travelfusion.xmlclient.ri.xobject.misc.XGetCurrenciesRequest;
import org.travelfusion.xmlclient.ri.xobject.misc.XGetCurrenciesResponse;

import com.google.inject.Inject;
import com.google.inject.name.Named;

/**
 * @author Jesse McLaughlin (nzjess@gmail.com)
 */
@HandlesRequestsFor(XGetCurrenciesRequest.class)
public class GetCurrenciesHandler extends AbstractXmlToolRequestStAXResponseHandler<XGetCurrenciesRequest, XGetCurrenciesResponse> {

  private Set<String> tier1CurrencyCodes;

  @Inject(optional = true)
  public void setTier1CurrencyCodes(@Named("tier1CurrencyCodes") Set<String> tier1CurrencyCodes) {
    this.tier1CurrencyCodes = tier1CurrencyCodes;
  }

  @Override
  protected void fillTemplate() throws Exception {
  // nop
  }

  public XGetCurrenciesResponse handleResponse() throws Exception {
    Map<String, XCurrency> currencies = new HashMap<String, XCurrency>();

    XCurrency currency = null;
    String currentName = null;

    StringBuilder builder = new StringBuilder(32);

    done: for (int event; ((event = responseReader.next()) != XMLStreamConstants.END_DOCUMENT);) {
      switch (event) {
        case XMLStreamConstants.START_ELEMENT:
          builder.setLength(0);
          currentName = responseReader.getName().getLocalPart();
          if (currency == null) {
            if ("Currency".equals(currentName)) {
              currency = new XCurrency();
            }
          }
          break;
        case XMLStreamConstants.CHARACTERS:
          if (currency != null) {
            builder.append(responseReader.getTextCharacters(), responseReader.getTextStart(), responseReader.getTextLength());
          }
          break;
        case XMLStreamConstants.END_ELEMENT:
          if (currency != null) {
            currentName = responseReader.getName().getLocalPart();
            if ("Code".equals(currentName)) {
              currency.setCode(builder.toString().trim());
              currency.setTier1(tier1CurrencyCodes == null || tier1CurrencyCodes.contains(currency.getCode()));
            }
            else if ("Name".equals(currentName)) {
              currency.setName(builder.toString().trim());
            }
            else if ("UsdRate".equals(currentName)) {
              currency.setUsdRate(Double.parseDouble(builder.toString().trim()));
            }
            else if ("Currency".equals(currentName)) {
              currencies.put(currency.getCode(), currency);
              currency = null;
            }
          }
          else if ("CurrenciesList".equals(currentName)) {
            break done;
          }
          currentName = null;
          break;
      }
    }

    XGetCurrenciesResponse response = new XGetCurrenciesResponse();
    response.setCurrencies(currencies);

    return response;
  }
}
